☕ Java-Mastery-Hub

A structured Java learning repository containing fundamentals, design patterns, projects, and competitive programming solutions.

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"Learning Java through implementation, projects, and problem solving."

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📖 About

Java-Mastery-Hub is a repository created for learning and practicing Java programming concepts through hands-on coding.

This repository includes:

✅ Java Fundamentals
✅ Object Oriented Programming Concepts
✅ Design Pattern Implementations
✅ Real-world Project Development
✅ Competitive Programming Problems

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📂 Repository Structure

Java-Mastery-Hub
│
├── Java Basics
│   ├── Arrays
│   ├── Functions
│   ├── Hello World
│   ├── Tax Calculator
│   └── Basic Java Programs
│
├── Design Pattern
│   ├── Strategy Pattern
│   ├── Observer Pattern
│   ├── Decorator Pattern
│   ├── Simple Factory Pattern
│   ├── Factory Method Pattern
│   ├── Abstract Factory Pattern
│   ├── Singleton Pattern
│   ├── Command Pattern
│   ├── Adapter Pattern
│   ├── Facade Pattern
│   ├── Template Method Pattern
│   ├── Iterator Pattern
│   ├── Composite Pattern
│   ├── State Pattern
│   ├── Proxy Pattern
│   └── Compound Pattern
│
├── Design Pattern Project
│   └── Shopping Management System
│
└── Competitive Problems
    ├── Linked List Problems
    ├── Matrix Problems
    ├── Merge Linked List
    ├── Missing Number Problems
    └── Water Trapping Problems

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🚀 Java Concepts Covered

Topic	Status
Java Basics	✅
Arrays	✅
Functions	✅
OOP Concepts	✅
Problem Solving	✅

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🧠 Design Patterns Implemented

Creational	Structural	Behavioral
Simple Factory	Adapter	Strategy
Factory Method	Facade	Observer
Abstract Factory	Decorator	Command
Singleton	Composite	Template Method
	Proxy	Iterator
		State
		Compound

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💻 Featured Project

🛒 Shopping Management System

🎯 Aim

To design and implement a Shopping Management System using multiple design patterns to demonstrate modular, scalable, and maintainable software architecture.

🔥 Design Patterns Used

1️⃣ Abstract Factory Pattern

Used for creating product categories dynamically.

Products:

• Clothing

  • Men
  • Women
  • Kids

• Furniture

  • Wooden
  • Plastic
  • Glass

• Mobile

  • Apple
  • Samsung
  • Oppo

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2️⃣ Strategy Pattern

Used for interchangeable payment methods.

Payment options:

• Credit Card Payment
• UPI Payment

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3️⃣ Command Pattern

Used for handling order operations.

Commands:

• Place Order
• Cancel Order

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4️⃣ Observer Pattern

Used for notifications.

Observers:

• User Observer
• Admin Observer

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⚔️ Competitive Programming

Problems currently included:

✔ Linked List Problems
✔ Matrix Problems
✔ Missing Number Problems
✔ Water Trapping Problems
✔ Merge Linked List Problems

More problem-solving questions will be added continuously.

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🛠 Technologies Used

• Java
• Object-Oriented Programming
• Design Patterns
• DSA
• VS Code

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📈 Learning Progress

Java Basics ██████████ 100%

Design Patterns █████████░ 90%

Projects ████████░░ 80%

Competitive Coding ███████░░░ 70%

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🤝 Contributions

Suggestions and improvements are always welcome.

If you find something useful:

⭐ Star the repository

🍴 Fork the repository

📝 Create Pull Requests

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Built with ☕ and continuous learning